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6588 | serge | 1 | /* |
2 | * fixmap.h: compile-time virtual memory allocation |
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3 | * |
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4 | * This file is subject to the terms and conditions of the GNU General Public |
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5 | * License. See the file "COPYING" in the main directory of this archive |
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6 | * for more details. |
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7 | * |
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8 | * Copyright (C) 1998 Ingo Molnar |
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9 | * |
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10 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 |
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11 | * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009 |
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12 | */ |
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13 | |||
14 | #ifndef _ASM_X86_FIXMAP_H |
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15 | #define _ASM_X86_FIXMAP_H |
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16 | |||
17 | #ifndef __ASSEMBLY__ |
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18 | #include |
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19 | #include |
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20 | #include |
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21 | #include |
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22 | #include |
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23 | #ifdef CONFIG_X86_32 |
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24 | #include |
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25 | #include |
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26 | #else |
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27 | #include |
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28 | #endif |
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29 | |||
30 | /* |
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31 | * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall |
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32 | * uses fixmaps that relies on FIXADDR_TOP for proper address calculation. |
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33 | * Because of this, FIXADDR_TOP x86 integration was left as later work. |
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34 | */ |
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35 | #ifdef CONFIG_X86_32 |
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36 | /* used by vmalloc.c, vsyscall.lds.S. |
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37 | * |
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38 | * Leave one empty page between vmalloc'ed areas and |
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39 | * the start of the fixmap. |
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40 | */ |
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41 | extern unsigned long __FIXADDR_TOP; |
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42 | #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP) |
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43 | #else |
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44 | #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1< |
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45 | PAGE_SIZE) |
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46 | #endif |
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47 | |||
48 | |||
49 | /* |
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50 | * Here we define all the compile-time 'special' virtual |
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51 | * addresses. The point is to have a constant address at |
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52 | * compile time, but to set the physical address only |
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53 | * in the boot process. |
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54 | * for x86_32: We allocate these special addresses |
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55 | * from the end of virtual memory (0xfffff000) backwards. |
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56 | * Also this lets us do fail-safe vmalloc(), we |
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57 | * can guarantee that these special addresses and |
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58 | * vmalloc()-ed addresses never overlap. |
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59 | * |
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60 | * These 'compile-time allocated' memory buffers are |
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61 | * fixed-size 4k pages (or larger if used with an increment |
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62 | * higher than 1). Use set_fixmap(idx,phys) to associate |
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63 | * physical memory with fixmap indices. |
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64 | * |
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65 | * TLB entries of such buffers will not be flushed across |
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66 | * task switches. |
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67 | */ |
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68 | enum fixed_addresses { |
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69 | #ifdef CONFIG_X86_32 |
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70 | FIX_HOLE, |
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71 | #else |
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72 | #ifdef CONFIG_X86_VSYSCALL_EMULATION |
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73 | VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT, |
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74 | #endif |
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75 | #ifdef CONFIG_PARAVIRT_CLOCK |
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76 | PVCLOCK_FIXMAP_BEGIN, |
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77 | PVCLOCK_FIXMAP_END = PVCLOCK_FIXMAP_BEGIN+PVCLOCK_VSYSCALL_NR_PAGES-1, |
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78 | #endif |
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79 | #endif |
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80 | FIX_DBGP_BASE, |
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81 | FIX_EARLYCON_MEM_BASE, |
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82 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
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83 | FIX_OHCI1394_BASE, |
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84 | #endif |
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85 | #ifdef CONFIG_X86_LOCAL_APIC |
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86 | FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */ |
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87 | #endif |
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88 | #ifdef CONFIG_X86_IO_APIC |
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89 | FIX_IO_APIC_BASE_0, |
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90 | FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1, |
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91 | #endif |
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92 | FIX_RO_IDT, /* Virtual mapping for read-only IDT */ |
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93 | #ifdef CONFIG_X86_32 |
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94 | FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ |
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95 | FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, |
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96 | #ifdef CONFIG_PCI_MMCONFIG |
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97 | FIX_PCIE_MCFG, |
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98 | #endif |
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99 | #endif |
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100 | #ifdef CONFIG_PARAVIRT |
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101 | FIX_PARAVIRT_BOOTMAP, |
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102 | #endif |
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103 | FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */ |
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104 | FIX_TEXT_POKE0, /* first page is last, because allocation is backward */ |
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105 | #ifdef CONFIG_X86_INTEL_MID |
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106 | FIX_LNW_VRTC, |
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107 | #endif |
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108 | __end_of_permanent_fixed_addresses, |
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109 | |||
110 | /* |
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111 | * 512 temporary boot-time mappings, used by early_ioremap(), |
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112 | * before ioremap() is functional. |
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113 | * |
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114 | * If necessary we round it up to the next 512 pages boundary so |
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115 | * that we can have a single pgd entry and a single pte table: |
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116 | */ |
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117 | #define NR_FIX_BTMAPS 64 |
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118 | #define FIX_BTMAPS_SLOTS 8 |
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119 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) |
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120 | FIX_BTMAP_END = |
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121 | (__end_of_permanent_fixed_addresses ^ |
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122 | (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) & |
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123 | -PTRS_PER_PTE |
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124 | ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - |
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125 | (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1)) |
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126 | : __end_of_permanent_fixed_addresses, |
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127 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, |
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128 | #ifdef CONFIG_X86_32 |
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129 | FIX_WP_TEST, |
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130 | #endif |
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131 | #ifdef CONFIG_INTEL_TXT |
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132 | FIX_TBOOT_BASE, |
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133 | #endif |
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134 | __end_of_fixed_addresses |
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135 | }; |
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136 | |||
137 | |||
138 | extern void reserve_top_address(unsigned long reserve); |
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139 | |||
140 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) |
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141 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) |
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142 | |||
143 | extern int fixmaps_set; |
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144 | |||
145 | extern pte_t *kmap_pte; |
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146 | extern pgprot_t kmap_prot; |
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147 | extern pte_t *pkmap_page_table; |
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148 | |||
149 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); |
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150 | void native_set_fixmap(enum fixed_addresses idx, |
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151 | phys_addr_t phys, pgprot_t flags); |
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152 | |||
153 | #ifndef CONFIG_PARAVIRT |
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154 | static inline void __set_fixmap(enum fixed_addresses idx, |
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155 | phys_addr_t phys, pgprot_t flags) |
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156 | { |
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157 | native_set_fixmap(idx, phys, flags); |
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158 | } |
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159 | #endif |
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160 | |||
161 | #include |
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162 | |||
163 | #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags) |
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164 | #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0)) |
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165 | |||
166 | void __early_set_fixmap(enum fixed_addresses idx, |
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167 | phys_addr_t phys, pgprot_t flags); |
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168 | |||
169 | #endif /* !__ASSEMBLY__ */ |
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170 | #endif /* _ASM_X86_FIXMAP_H */><> |